Production of finely divided rare earth ammonium oxalates/finely divided rare earth oxides
US5518703A · kind A · utility
6Cited by
2References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 1994 |
| Grant date | May 21, 1996 |
| Priority date | — |
| Expiry date | May 3, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/21
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Very finely divided ammonium rare earth double oxalates, readily converted into corresponding rare earth oxides by calcination, such oxides being well adopted, e.g., for the production of luminescent compounds therefrom, are prepared by (a) admixing a second solution of a rare earth compound, e.g., a salt, with a first solution containing oxalate and ammonium ions, (b) then separating the precipitate thus obtained from such mixed solution of reaction, and (c) optionally, drying the separated precipitate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.